freebsd-dev/sys/dev/netmap/if_ixl_netmap.h
Luiz Otavio O Souza c3e9b4db8c Update the current version of netmap to bring it in sync with the github
version.

This commit contains mostly refactoring, a few fixes and minor added
functionality.

Submitted by:	Vincenzo Maffione <v.maffione at gmail.com>
Requested by:	many
Sponsored by:	Rubicon Communications, LLC (Netgate)
2017-06-12 22:53:18 +00:00

422 lines
13 KiB
C

/*
* Copyright (C) 2015, Luigi Rizzo. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* $FreeBSD$
*
* netmap support for: ixl
*
* derived from ixgbe
* netmap support for a network driver.
* This file contains code but only static or inline functions used
* by a single driver. To avoid replication of code we just #include
* it near the beginning of the standard driver.
* For ixl the file is imported in two places, hence the conditional at the
* beginning.
*/
#include <net/netmap.h>
#include <sys/selinfo.h>
/*
* Some drivers may need the following headers. Others
* already include them by default
#include <vm/vm.h>
#include <vm/pmap.h>
*/
#include <dev/netmap/netmap_kern.h>
int ixl_netmap_txsync(struct netmap_kring *kring, int flags);
int ixl_netmap_rxsync(struct netmap_kring *kring, int flags);
extern int ixl_rx_miss, ixl_rx_miss_bufs, ixl_crcstrip;
#ifdef NETMAP_IXL_MAIN
/*
* device-specific sysctl variables:
*
* ixl_crcstrip: 0: NIC keeps CRC in rx frames, 1: NIC strips it (default).
* During regular operations the CRC is stripped, but on some
* hardware reception of frames not multiple of 64 is slower,
* so using crcstrip=0 helps in benchmarks.
*
* ixl_rx_miss, ixl_rx_miss_bufs:
* count packets that might be missed due to lost interrupts.
*/
SYSCTL_DECL(_dev_netmap);
/*
* The xl driver by default strips CRCs and we do not override it.
*/
#if 0
SYSCTL_INT(_dev_netmap, OID_AUTO, ixl_crcstrip,
CTLFLAG_RW, &ixl_crcstrip, 1, "NIC strips CRC on rx frames");
#endif
SYSCTL_INT(_dev_netmap, OID_AUTO, ixl_rx_miss,
CTLFLAG_RW, &ixl_rx_miss, 0, "potentially missed rx intr");
SYSCTL_INT(_dev_netmap, OID_AUTO, ixl_rx_miss_bufs,
CTLFLAG_RW, &ixl_rx_miss_bufs, 0, "potentially missed rx intr bufs");
/*
* Register/unregister. We are already under netmap lock.
* Only called on the first register or the last unregister.
*/
static int
ixl_netmap_reg(struct netmap_adapter *na, int onoff)
{
struct ifnet *ifp = na->ifp;
struct ixl_vsi *vsi = ifp->if_softc;
struct ixl_pf *pf = (struct ixl_pf *)vsi->back;
IXL_PF_LOCK(pf);
ixl_disable_intr(vsi);
/* Tell the stack that the interface is no longer active */
ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE);
//set_crcstrip(&adapter->hw, onoff);
/* enable or disable flags and callbacks in na and ifp */
if (onoff) {
nm_set_native_flags(na);
} else {
nm_clear_native_flags(na);
}
ixl_init_locked(pf); /* also enables intr */
//set_crcstrip(&adapter->hw, onoff); // XXX why twice ?
IXL_PF_UNLOCK(pf);
return (ifp->if_drv_flags & IFF_DRV_RUNNING ? 0 : 1);
}
/*
* The attach routine, called near the end of ixl_attach(),
* fills the parameters for netmap_attach() and calls it.
* It cannot fail, in the worst case (such as no memory)
* netmap mode will be disabled and the driver will only
* operate in standard mode.
*/
static void
ixl_netmap_attach(struct ixl_vsi *vsi)
{
struct netmap_adapter na;
bzero(&na, sizeof(na));
na.ifp = vsi->ifp;
na.na_flags = NAF_BDG_MAYSLEEP;
// XXX check that queues is set.
nm_prinf("queues is %p\n", vsi->queues);
if (vsi->queues) {
na.num_tx_desc = vsi->queues[0].num_desc;
na.num_rx_desc = vsi->queues[0].num_desc;
}
na.nm_txsync = ixl_netmap_txsync;
na.nm_rxsync = ixl_netmap_rxsync;
na.nm_register = ixl_netmap_reg;
na.num_tx_rings = na.num_rx_rings = vsi->num_queues;
netmap_attach(&na);
}
#else /* !NETMAP_IXL_MAIN, code for ixl_txrx.c */
/*
* Reconcile kernel and user view of the transmit ring.
*
* All information is in the kring.
* Userspace wants to send packets up to the one before kring->rhead,
* kernel knows kring->nr_hwcur is the first unsent packet.
*
* Here we push packets out (as many as possible), and possibly
* reclaim buffers from previously completed transmission.
*
* The caller (netmap) guarantees that there is only one instance
* running at any time. Any interference with other driver
* methods should be handled by the individual drivers.
*/
int
ixl_netmap_txsync(struct netmap_kring *kring, int flags)
{
struct netmap_adapter *na = kring->na;
struct ifnet *ifp = na->ifp;
struct netmap_ring *ring = kring->ring;
u_int nm_i; /* index into the netmap ring */
u_int nic_i; /* index into the NIC ring */
u_int n;
u_int const lim = kring->nkr_num_slots - 1;
u_int const head = kring->rhead;
/*
* interrupts on every tx packet are expensive so request
* them every half ring, or where NS_REPORT is set
*/
u_int report_frequency = kring->nkr_num_slots >> 1;
/* device-specific */
struct ixl_vsi *vsi = ifp->if_softc;
struct ixl_queue *que = &vsi->queues[kring->ring_id];
struct tx_ring *txr = &que->txr;
bus_dmamap_sync(txr->dma.tag, txr->dma.map,
BUS_DMASYNC_POSTREAD);
/*
* First part: process new packets to send.
* nm_i is the current index in the netmap ring,
* nic_i is the corresponding index in the NIC ring.
*
* If we have packets to send (nm_i != head)
* iterate over the netmap ring, fetch length and update
* the corresponding slot in the NIC ring. Some drivers also
* need to update the buffer's physical address in the NIC slot
* even NS_BUF_CHANGED is not set (PNMB computes the addresses).
*
* The netmap_reload_map() calls is especially expensive,
* even when (as in this case) the tag is 0, so do only
* when the buffer has actually changed.
*
* If possible do not set the report/intr bit on all slots,
* but only a few times per ring or when NS_REPORT is set.
*
* Finally, on 10G and faster drivers, it might be useful
* to prefetch the next slot and txr entry.
*/
nm_i = kring->nr_hwcur;
if (nm_i != head) { /* we have new packets to send */
nic_i = netmap_idx_k2n(kring, nm_i);
__builtin_prefetch(&ring->slot[nm_i]);
__builtin_prefetch(&txr->buffers[nic_i]);
for (n = 0; nm_i != head; n++) {
struct netmap_slot *slot = &ring->slot[nm_i];
u_int len = slot->len;
uint64_t paddr;
void *addr = PNMB(na, slot, &paddr);
/* device-specific */
struct i40e_tx_desc *curr = &txr->base[nic_i];
struct ixl_tx_buf *txbuf = &txr->buffers[nic_i];
u64 flags = (slot->flags & NS_REPORT ||
nic_i == 0 || nic_i == report_frequency) ?
((u64)I40E_TX_DESC_CMD_RS << I40E_TXD_QW1_CMD_SHIFT) : 0;
/* prefetch for next round */
__builtin_prefetch(&ring->slot[nm_i + 1]);
__builtin_prefetch(&txr->buffers[nic_i + 1]);
NM_CHECK_ADDR_LEN(na, addr, len);
if (slot->flags & NS_BUF_CHANGED) {
/* buffer has changed, reload map */
netmap_reload_map(na, txr->dma.tag, txbuf->map, addr);
}
slot->flags &= ~(NS_REPORT | NS_BUF_CHANGED);
/* Fill the slot in the NIC ring. */
curr->buffer_addr = htole64(paddr);
curr->cmd_type_offset_bsz = htole64(
((u64)len << I40E_TXD_QW1_TX_BUF_SZ_SHIFT) |
flags |
((u64)I40E_TX_DESC_CMD_EOP << I40E_TXD_QW1_CMD_SHIFT)
); // XXX more ?
/* make sure changes to the buffer are synced */
bus_dmamap_sync(txr->dma.tag, txbuf->map,
BUS_DMASYNC_PREWRITE);
nm_i = nm_next(nm_i, lim);
nic_i = nm_next(nic_i, lim);
}
kring->nr_hwcur = head;
/* synchronize the NIC ring */
bus_dmamap_sync(txr->dma.tag, txr->dma.map,
BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
/* (re)start the tx unit up to slot nic_i (excluded) */
wr32(vsi->hw, txr->tail, nic_i);
}
/*
* Second part: reclaim buffers for completed transmissions.
*/
nic_i = LE32_TO_CPU(*(volatile __le32 *)&txr->base[que->num_desc]);
if (nic_i != txr->next_to_clean) {
/* some tx completed, increment avail */
txr->next_to_clean = nic_i;
kring->nr_hwtail = nm_prev(netmap_idx_n2k(kring, nic_i), lim);
}
return 0;
}
/*
* Reconcile kernel and user view of the receive ring.
* Same as for the txsync, this routine must be efficient.
* The caller guarantees a single invocations, but races against
* the rest of the driver should be handled here.
*
* On call, kring->rhead is the first packet that userspace wants
* to keep, and kring->rcur is the wakeup point.
* The kernel has previously reported packets up to kring->rtail.
*
* If (flags & NAF_FORCE_READ) also check for incoming packets irrespective
* of whether or not we received an interrupt.
*/
int
ixl_netmap_rxsync(struct netmap_kring *kring, int flags)
{
struct netmap_adapter *na = kring->na;
struct ifnet *ifp = na->ifp;
struct netmap_ring *ring = kring->ring;
u_int nm_i; /* index into the netmap ring */
u_int nic_i; /* index into the NIC ring */
u_int n;
u_int const lim = kring->nkr_num_slots - 1;
u_int const head = kring->rhead;
int force_update = (flags & NAF_FORCE_READ) || kring->nr_kflags & NKR_PENDINTR;
/* device-specific */
struct ixl_vsi *vsi = ifp->if_softc;
struct ixl_queue *que = &vsi->queues[kring->ring_id];
struct rx_ring *rxr = &que->rxr;
if (head > lim)
return netmap_ring_reinit(kring);
/* XXX check sync modes */
bus_dmamap_sync(rxr->dma.tag, rxr->dma.map,
BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
/*
* First part: import newly received packets.
*
* nm_i is the index of the next free slot in the netmap ring,
* nic_i is the index of the next received packet in the NIC ring,
* and they may differ in case if_init() has been called while
* in netmap mode. For the receive ring we have
*
* nic_i = rxr->next_check;
* nm_i = kring->nr_hwtail (previous)
* and
* nm_i == (nic_i + kring->nkr_hwofs) % ring_size
*
* rxr->next_check is set to 0 on a ring reinit
*/
if (netmap_no_pendintr || force_update) {
int crclen = ixl_crcstrip ? 0 : 4;
uint16_t slot_flags = kring->nkr_slot_flags;
nic_i = rxr->next_check; // or also k2n(kring->nr_hwtail)
nm_i = netmap_idx_n2k(kring, nic_i);
for (n = 0; ; n++) {
union i40e_32byte_rx_desc *curr = &rxr->base[nic_i];
uint64_t qword = le64toh(curr->wb.qword1.status_error_len);
uint32_t staterr = (qword & I40E_RXD_QW1_STATUS_MASK)
>> I40E_RXD_QW1_STATUS_SHIFT;
if ((staterr & (1<<I40E_RX_DESC_STATUS_DD_SHIFT)) == 0)
break;
ring->slot[nm_i].len = ((qword & I40E_RXD_QW1_LENGTH_PBUF_MASK)
>> I40E_RXD_QW1_LENGTH_PBUF_SHIFT) - crclen;
ring->slot[nm_i].flags = slot_flags;
bus_dmamap_sync(rxr->ptag,
rxr->buffers[nic_i].pmap, BUS_DMASYNC_POSTREAD);
nm_i = nm_next(nm_i, lim);
nic_i = nm_next(nic_i, lim);
}
if (n) { /* update the state variables */
if (netmap_no_pendintr && !force_update) {
/* diagnostics */
ixl_rx_miss ++;
ixl_rx_miss_bufs += n;
}
rxr->next_check = nic_i;
kring->nr_hwtail = nm_i;
}
kring->nr_kflags &= ~NKR_PENDINTR;
}
/*
* Second part: skip past packets that userspace has released.
* (kring->nr_hwcur to head excluded),
* and make the buffers available for reception.
* As usual nm_i is the index in the netmap ring,
* nic_i is the index in the NIC ring, and
* nm_i == (nic_i + kring->nkr_hwofs) % ring_size
*/
nm_i = kring->nr_hwcur;
if (nm_i != head) {
nic_i = netmap_idx_k2n(kring, nm_i);
for (n = 0; nm_i != head; n++) {
struct netmap_slot *slot = &ring->slot[nm_i];
uint64_t paddr;
void *addr = PNMB(na, slot, &paddr);
union i40e_32byte_rx_desc *curr = &rxr->base[nic_i];
struct ixl_rx_buf *rxbuf = &rxr->buffers[nic_i];
if (addr == NETMAP_BUF_BASE(na)) /* bad buf */
goto ring_reset;
if (slot->flags & NS_BUF_CHANGED) {
/* buffer has changed, reload map */
netmap_reload_map(na, rxr->ptag, rxbuf->pmap, addr);
slot->flags &= ~NS_BUF_CHANGED;
}
curr->read.pkt_addr = htole64(paddr);
curr->read.hdr_addr = 0; // XXX needed
bus_dmamap_sync(rxr->ptag, rxbuf->pmap,
BUS_DMASYNC_PREREAD);
nm_i = nm_next(nm_i, lim);
nic_i = nm_next(nic_i, lim);
}
kring->nr_hwcur = head;
bus_dmamap_sync(rxr->dma.tag, rxr->dma.map,
BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
/*
* IMPORTANT: we must leave one free slot in the ring,
* so move nic_i back by one unit
*/
nic_i = nm_prev(nic_i, lim);
wr32(vsi->hw, rxr->tail, nic_i);
}
return 0;
ring_reset:
return netmap_ring_reinit(kring);
}
#endif /* !NETMAP_IXL_MAIN */
/* end of file */